Iris

"Iris" a.k.a. "The Old Routine" is one of nine short stories written by Leslie Charteris and included in the twenty-eighth Saint book Saint Errant published in 1948.

Plot
When Simon Templar is accused of blackmailing several Chicago underworld leaders, Templar and Patricia Holm investigate.

Television adaptation
"Iris" was adapted as an episode of The Saint TV series starring Roger Moore and was first broadcast during the show's second season on 7 November 1963.